Nilim Kumar has 17 collections of poems, 3 collections of novels and one book of essays in original Assamese language. He has 2 collections of poems in English translation, 2 collections of poems in Hindi translation, one collection of poems in Nepali translation. His poems have been translated into French, English, Germany, Spanish, Hindi, Marathi, Gujarati,Bengali, Odisha, Kannada , Nepali etc. He has visited France as an Indian poet for French- Indian cultural Exchange, visited Bangladesh by Sahitya Akammi . His poems are included in Poems are in the syllabus of Guwahati University, Dibrugarh University, Cotton University and Bengaluru University.